• 剛開始學習 swift 一段時間，學習果然還是還是要不停地敲代碼的啊，全部代碼都寫在導航控制器 UINavigationController 的類里面。先說下 swift 的整個控制器的側滑返回實現
• swift
• 1，第一種實現方法

//        獲取手勢屬性
        /*
        var count : UInt32 = 0
        let ivars = class_copyIvarList(UIGestureRecognizer.self, &count)!
        
        for i in 0..<count {
            let nameP = ivar_getName(ivars[Int(i)])!
            let name = String(cString: nameP)
            print(name)//打印出所有屬性
        }
       free(ivars);
        */
//判斷并獲取 targets 的 action
       guard let targets = interactivePopGestureRecognizer!.value(forKey: "_targets") as? [NSObject] else{return}
        
        let targetObjc = targets[0]
        
        let target = targetObjc.value(forKey: "target")
//由于直接使用它的 action 會崩潰，所以自己需要重新構建一個 Selector，自定義一個手勢
        let action = Selector(("handleNavigationTransition:"))
        
        let panGes = UIPanGestureRecognizer(target: target, action: action)
        
        view.addGestureRecognizer(panGes)

• 2，第二種實現方法

 interactivePopGestureRecognizer!.delegate = self as? UIGestureRecognizerDelegate
 object_setClass(interactivePopGestureRecognizer!.self, UIPanGestureRecognizer.classForCoder())

• OC 實現側滑（實現其實和 swift 差不多）
• 1，第一種實現方法

    unsigned int count = 0;
    Ivar *ivars = class_copyIvarList([UIGestureRecognizer class], &count);
    //獲取手勢的屬性變量
    for (int i = 0; i<count; i++) {
        
        NSString *str = [NSString stringWithCString:ivar_getName(ivars[(int)i]) encoding:NSUTF8StringEncoding];
        
        NSLog(@"%@",str);
    }    
    free(ivars);
    id targets = [self.interactivePopGestureRecognizer  valueForKey:@"_targets"];
    
    NSLog(@"%@",targets);
    id target = [targets[0] valueForKey:@"target"];
    //更具 target 獲取 selector
    SEL selector = NSSelectorFromString(@"handleNavigationTransition:");
    UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:target action:selector];
    [self.view addGestureRecognizer:pan];

• 2，第二種實現方法

    // 更換interactivePopGestureRecognizer的delegate為navigationController自己
    self.interactivePopGestureRecognizer.delegate = self;
    // 自帶的邊緣返回手勢UIScreenEdgePanGestureRecognizer，但只負責edge部分。換成全屏的UIPanGestureRecognizer
    object_setClass(self.interactivePopGestureRecognizer, [UIPanGestureRecognizer class]);